I tried all three flavors available at the time (Strawberry Banana, Wild Berry, and Creamy Chocolate).

The Creamy Chocolate shake is the standout. Its flavor is better than either of the Atkins Advantage chocolate shake flavors. It's 3g net carbs rather than 2g like the Advantage shakes, but that extra carb is definitely worth it. I'd describe the flavor (not the texture, obviously) as being something like a fast-food-restaurant chocolate shake.

The other two flavors were also nice and I'll probably order them again.

The different packaging from the Advantage shakes, with a re-closeable cap instead of a foil tab, is much nicer, especially if you want to drink on the run or just want to drink some of it and save the rest in the refrigerator.